Freescale Semiconductor MPC8260 - Manual (Page 996)

ATM Controller and AAL0, AAL1, and AAL5
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
30-76 Freescale Semiconductor
30.10.5.9 AAL5, AAL1 CES User-Defined Cell—RxBD Extension
In user-defined cell mode, the AAL5 and AAL1 CES RxBDs are extended to 32 bytes; see Figure 30-49 .
NOTE
For AAL0, a complete cell, including the UDC header, is stored in the
buffer; the AAL0 BD size is always 8 bytes.
30.10.5.10 AAL5 TxBDs
Figure 30-50 shows the AAL5 TxBD.
Table 30-38 describes AAL5 TxBD fields.
Offset + 0x08 Extra Cell Header.
Used to store the user-defined cell’s extra cell header. The extra cell header can be 1–12 bytes long.
Offset + 0x14 Reserved (12 bytes)
Figure 30-49. User-Defined Cell—RxBD Extension
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Offset + 0x00 R — W I L — CM — CLP CNG —
Offset + 0x02 Data Length (DL)
Offset + 0x04 Tx Data Buffer Pointer (TXDBPTR)
Offset + 0x06
Figure 30-50. AAL5 TxBD